Eraser mounting



Dec. 23, 1941. L. J. MosT ERASER MOUNTING Filed Jan. 1l, 1941 @f2/cy j INVENTOR LAT. moan BY ya M14/wy Patented Dec. 23, 1941 UNITEDv STATES PATENT OFFICE ERASER MOUNTING Lucifer J. Most, Hudson County, N. J. Application January 11, 1941, Serial No. 314,068

(Cl. 1Z0- 38) 3 Claims.

My invention relates to eraser mounting for mechanical pencils and the object thereof is to utilize the lateral resiliency of the rubber eraser for providing the necessary pressure to maintain a proper frictional engagement between the cap for the eraser and the mounting for same.

The object of the invention is to provide a simple, inexpensive and eillcient eraser mounting by means of which any wear of the rubber eraser can be easily or quickly compensated, without reducing the frictional engagement between the cap and the eraser mounting.

In the type of eraser mountings to which my invention appertains. it is common to provide a cap for the eraser, which is frictionally mounted on the upper end of the barrel, but due to the frequent removal of the cap for the use of the eraser, the frlctional contact between the cap and the support for same wears of! and the cap be- Figure 2 is a cross-section on line 2 2 Figure 1.

Referring to the drawing, 5 is the upper part of a pencil barrel provided with a suitable bore 8, into which is tightly iitted the lower end 'I of a sleeve 8. 'I'he sleeve 8 is provided with a iiange 9 which rests on the end of the barrel when the lower portion 'I of the sleeve is tted into the bore 6 of the barrel 5. The portion I0 of the sleeve which projects above the ange, has a longitudinal slit Il, permitting it to expand laterally.

Fitting into the splitted portion I0 of the sleeve 8 is an eraser holder I2 in the shape of a sleeve which has a longitudinal slit or gap. Fitting into the longitudinal splitted holder I2 is a rubber eraser I4, cylindrical in shape. The eraser holder I2 being split through its entire lengthopens up under the lateral pressure of the rubber eraser I4, tending to widen the gap I3 when the rubber is fitted into the holder I2. In turn, when the holder I2 with the rubber therein, is tted into the split portion I0 of the sleeve 8, it tends to widen the gap of the slit I I 1 To prevent the holder i 2 from being pushed too far into the split portion Il of the sleeve l.

it is provided with a iiange or bead I5 between its end to engage the end of the upper part Il) of the sleeve 8 and forms a stop for the holder I2 in the sleeve 8.

' Due to the lateral expansion of both the holder I2 and the portion vvIii of the sleeve 8 under the lateral vpressure of the rubber eraser I4, a pressure is exerted on a cap I6 which is made to fit the split portion I0 of the sleeve 8, thereby providing a constant pressure between the contacting surfaces of sleeve portion I0 and the cap I6. The ilange 9 of the sleeve 8 forms an abutment for the cap on the barrel 5.

By providing an eraser mounting as described, I provide a constant pressure on the cap from the later resiliency of the rubber eraser, thereby insuring a perfect and constant irictionai engagement between the cap and the eraser mounting, which is not subject to wear by the constant removal of the cap from the mounting.

I claim:

l. An eraser mounting for a `pencil comprising,

a longitudinally split cylindrical sleeve adapted to l be fitted onto a cylindrical rubber eraser. said sleeve adapted to be laterally expanded when engaged by an eraser, a second sleeve having a portion thereof longitudinally slit', said iirst sleeve being adapted to fit frictionally into the slit portion of said second sleeve, and a cap adapted to frictionally engage the exterior of the longitudinally slit portion of said second sleeve.v

2. An eraser mounting for a pencil comprising in combination, a barrel having a bore on its upper end, a sleeve iltting tightly into said bore, said sleeve having a longitudinally slit portion thereof above the barrel, a longitudinally slit sleeve made to' iit frictionally into the slitted,

portion of the rst sleeve, said slitted sleeve being adapted to expand laterally when iitted on to a eylindrically shaped rubber eraser, and a cap frictionally engaging the slitted portion of the iirst sleeve.

3. An eraser mounting for a pencil comprising in combination, a barrel having on its upper end a projecting slitted sleeve portion, a longitudinally slitted sleeve tting frictionally into the projecting slitted sleeve portion, said slitted sleeve V being adapted to expand laterally when engaging a rubber eraser, and a cap tted' frictionally on the exterior of the projecting slitted sleeve portion.

LUCIFER J. MOST. 

